Fermotan Skin is a blend of skin and wood proanthocyanidins and ellagic tannins. Fermotan Skin is a tannin extracted from grape skins to stabilize the colour of red and rosé wines. Anthocyanins are extracted more quickly than tannins already from the start of fermentation (also thanks to the help of Endozym). In order not to nullify the extraction of these colour compounds, it is indispensable to protect them from oxygen and to turn them towards stable polymerization forms, such as the ones with proanthocyanidins. The synergy between these two tannins (ellagic and proanthocyanidinic) exerts a protective action towards anthocyanins.